TAILIEUCHUNG - Lecture 1: The Atmosphere, Aerodynamic and Airplane Nomenclatures
Basic definitions, The atmosphere, Aerodynamic Nomenclature, Aircraft Instruments, Airplane Nomenclatures,. as the main contents of the lesson lecture 1 "The Atmosphere, Aerodynamic and Airplane Nomenclatures". Invite you to consult. | 1 The Atmosphere, Aerodynamic and Airplane Nomenclatures Aircraft Stability and Control – Atmosphere, Airplane Nomenclatures Ngô Khánh Hiếu Cơ học bay 2 - Các khái niệm cơ bản Ngô Khánh Hieu 1 2 Basic definitions (1/8) Pressure: - Static pressure is the pressure of the air above the elevation being considered. - to distinguish it from the total and dynamic pressures, the actual pressure of the fluid, which is associated not with its motion but with its state, is often referred to as the static pressure, but where the term pressure alone is used it refers to this static pressure. - Bernoulli’s equation for incompressible fluids: p : “free-stream pressure”, static pressure pT: total pressure (Stagnation pressure) Ngô Khánh Hiếu - The ratio of the pressure P at altitude to sea-level standard pressure Po is: - The equation of state: - Many pressure gages indicate the difference between the absolute pressure and the atmospheric pressure existing at the gage (gage presssure). Aircraft Stability and Control – Atmosphere, Airplane Nomenclatures where: R = 287 J/kgoK - Is the normal force per unit area acting on the fluid. - Standard atmospheric pressure at sea-level is defined as the pressure that can support a column of mercury 760 mm in length. So, its value is 105 N/m2 (or Ib/ft2). Cơ học bay 2 - Các khái niệm cơ bản Ngô Khánh Hieu 2 3 Temperature: - Is an abstract concept but can be thought of as a measure of the motion of molecular particles within a substance. - The temperatures are measured using the absolute Kelvin or Rankin scales. - The temperature of atmosphere varies significantly with altitude. The ratio of ambient temperature at altitude, T, to a sea-level standard value, To, is denoted by : The altitude (h) used in ISA standard atmosphere is “Geopotential altitudes” (not “Geometric altitudes”). However, the difference between these two altitudes at 30 km is about . Ngô Khánh Hiếu Aircraft Stability and Control – Atmosphere, Airplane .
đang nạp các trang xem trước
